Complete rebrand: Polkadot→Pezkuwi, Substrate→Bizinikiwi

- Replace PolkadotConfig with PezkuwiConfig
- Replace SubstrateConfig with BizinikiwConfig
- Rename config module files (polkadot.rs→pezkuwi.rs, substrate.rs→bizinikiwi.rs)
- Update all documentation and examples
- All 165 files updated, cargo check passes

testing/test-runtime/Cargo.toml

@@ -16,7 +16,7 @@ jsonrpsee = { workspace = true, features = [
 	"client-ws-transport-tls",
 ] }
 serde = { workspace = true }
-substrate-runner = { workspace = true }
+bizinikiwi-runner = { workspace = true }
 tokio = { workspace = true, features = ["rt-multi-thread"] }
 tokio-util = { workspace = true, features = ["compat"] }
 which = { workspace = true }